Complete Degradation of Gaseous Methanol over Pt/FeO_x Catalysts by Normal Temperature Catalytic Ozonation

Abstract

Normal temperature catalytic ozonation (NTCO) is a promising yet challenging method for the removal of volatile organic compounds (VOCs) because of limited activity of the catalysts at ambient temperature. Here, we report a series of Pt/FeO x catalysts prepared by the co-precipitation method for NTCO of gaseous methanol. All samples were found to be active and among them, the Pt/FeO x -400 (calcined at 400 °C) catalyst with a Pt cluster loading of 0.2% exhibited the highest activity, able to completely convert methanol into CO2 and H2O at 30 °C. Extensive experimental research suggested that the superior catalytic activity could be attributed to the highly dispersed Pt clusters and an appropriate molar ratio of Pt0/Pt2+. Furthermore, electron paramagnetic resonance and density functional theory computational studies revealed the mechanism that the Pt/FeO x -400 catalyst could activate O3 and water effectively to produce hydroxyl radicals responsible for the catalytic oxidation of methanol. The findings of this work may foster the development of technologies for normal temperature abatement of VOCs with low energy consumption.

Unveiling the Role of Atomically Dispersed Active Sites over Amorphous Iron Oxide Supported Pt Catalysts for Complete Catalytic Ozonation of Toluene at Low Temperature

“…It is known that ozone could be decomposed over a catalyst surface to generate active oxygen species. , In particular, O 3 could abstract a H atom from surface −OH to generate HO 3 which further decomposes into • OH, achieving a transformation from surface −OH groups to • OH radicals . For our catalysts, atomically dispersed Pt species interact with amorphous FeO x to form Pt–(OH) x O–Fe sites, facilitating the degradation of toluene into CO 2 and H 2 O. Herein, we propose a possible mechanism for toluene catalytic oxidation over Pt/FeO x -180 at normal temperature as shown in Figure .…”

“…16,62 In particular, O 3 could abstract a H atom from surface −OH to generate HO 3 which further decomposes into • OH, achieving a transformation from surface −OH groups to • OH radicals. 63…”

Selective 5-Hydroxymethylfurfural Hydrogenolysis to 2,5-Dimethylfuran over Bimetallic Pt-FeOx/AC Catalysts

“…Catalysts 2021, 11, x FOR PEER REVIEW 5 of 15 (71.3 and 74.7 eV) and two magenta peaks (72.4 and 75.6 eV), which could be assigned to Pt 0 and Pt 2+ , respectively [42,43]. The binding energies for Pt 4f transferred to higher values with the increase of Fe loading, accordingly.…”

“…Moreover, Figure 4b shows the Pt 4f XPS spectra for different catalysts; the Pt 2+ /Pt 0 ratios are also shown in Table 1. After curve fitting, the spectrum consisted of two blue peaks (71.3 and 74.7 eV) and two magenta peaks (72.4 and 75.6 eV), which could be assigned to Pt 0 and Pt 2+ , respectively [42,43]. The binding energies for Pt 4f transferred to higher values with the increase of Fe loading, accordingly.…”

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

“…In these technologies, wet flue gas desulfurization (WFGD) and selective catalytic reduction (SCR) denitration are the two most widely used SO 2 and NO x removal technologies. − Activated carbon adsorption is the main removal technology of heavy metals, Hg and As, from gas stream. − Alcohol amine absorption and catalytic oxidation are the most widely used treatment technologies of gaseous H 2 S. − The mainstream removal technologies of VOCs are rich due to huge types of VOCs and their different characteristics. Adsorption, absorption, condensation, and catalytic combustion are the common VOCs removal technologies. − Supporting Information (SI) Figure S1 shows the classification of these gaseous pollutants common removal technologies. In many typical gas emission sources (e.g., flue gas, biogas, natural gas, coke oven gas, coalbed methane, waste incineration tail gas, chemical process exhaust, etc.…”